/* ===== 使用指南 / 常见问题 页面专属样式 ===== */

.page-faq {
  --faq-gap: 20px;
  padding: 22px 0 96px;
  color: var(--c-warm);
}

/* --- 面包屑 --- */
.page-faq .bk-crumbs {
  margin-bottom: 24px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--c-muted);
}
.page-faq .bk-crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 0;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-faq .bk-crumbs li {
  display: inline-flex;
  align-items: center;
}
.page-faq .bk-crumbs li + li::before {
  content: "/";
  margin: 0 10px;
  color: var(--c-line);
}
.page-faq .bk-crumbs a {
  color: var(--c-muted);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}
.page-faq .bk-crumbs a:hover,
.page-faq .bk-crumbs a:focus-visible {
  color: var(--c-orange);
}
.page-faq .bk-crumbs [aria-current="page"] {
  color: var(--c-warm);
}

/* --- 首屏 --- */
.page-faq .faq-hero {
  display: grid;
  gap: 28px;
  align-items: center;
}
.page-faq .faq-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 7.4vw, 56px);
  font-weight: 800;
  line-height: 1.07;
  letter-spacing: -0.018em;
  color: var(--c-warm);
}
.page-faq .faq-hero__lead {
  margin: 20px 0 0;
  max-width: 52ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--c-muted);
}
.page-faq .faq-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}
.page-faq .faq-hero__media {
  position: relative;
  margin: 0;
  overflow: hidden;
  background: var(--c-stand);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}
.page-faq .faq-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
}
.page-faq .faq-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(155deg, rgba(35, 224, 200, 0.16), rgba(35, 224, 200, 0) 46%),
    linear-gradient(0deg, rgba(7, 11, 18, 0.9), rgba(7, 11, 18, 0) 62%);
}
.page-faq .faq-hero__media::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  z-index: 2;
  background: linear-gradient(90deg, var(--c-orange), var(--c-cyan) 58%, rgba(35, 224, 200, 0) 100%);
}

@media (min-width: 1000px) {
  .page-faq .faq-hero {
    grid-template-columns: 7fr 5fr;
    gap: 48px;
  }
  .page-faq .faq-hero__media {
    align-self: stretch;
  }
}

/* --- 锚点定位留白 --- */
.page-faq .faq-group,
.page-faq .bk-fold,
.page-faq .faq-channel,
.page-faq .faq-steps {
  scroll-margin-top: calc(var(--quickbar-h) + 20px);
}

/* --- 三步上手 --- */
.page-faq .faq-steps {
  margin-top: 58px;
}
.page-faq .faq-steps__title,
.page-faq .faq-contact__title {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 3.6vw, 30px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--c-warm);
}
.page-faq .faq-steps__lead {
  margin: 14px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-muted);
}
.page-faq .faq-steps__list {
  display: grid;
  gap: 14px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}
.page-faq .faq-step {
  position: relative;
  padding: 22px 20px 24px;
  background: linear-gradient(180deg, rgba(22, 34, 58, 0.92), rgba(14, 23, 38, 0.92));
  border-top: 1px solid var(--edge);
}
.page-faq .faq-step::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 56px;
  height: 2px;
  background: var(--c-cyan);
}
.page-faq .faq-step__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 38px;
  font-weight: 300;
  line-height: 1;
  letter-spacing: 0.03em;
  color: var(--c-cyan);
  opacity: 0.82;
}
.page-faq .faq-step__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--c-warm);
}
.page-faq .faq-step__text {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--c-muted);
}
.page-faq .faq-step__link {
  display: inline-block;
  margin-top: 16px;
  padding-bottom: 2px;
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(35, 224, 200, 0.35);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-faq .faq-step__link:hover,
.page-faq .faq-step__link:focus-visible {
  color: var(--c-orange);
  border-bottom-color: var(--c-orange);
}

@media (min-width: 820px) {
  .page-faq .faq-steps__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }
  .page-faq .faq-step {
    padding: 26px 26px 28px;
    background: transparent;
    border-top: 1px solid var(--edge);
  }
  .page-faq .faq-step + .faq-step::after {
    content: "";
    position: absolute;
    top: 8%;
    bottom: 8%;
    left: 0;
    width: 1px;
    transform: skewX(-9deg);
    background: linear-gradient(180deg, rgba(91, 107, 133, 0) 0%, var(--edge-strong) 34%, var(--edge-strong) 66%, rgba(91, 107, 133, 0) 100%);
  }
  .page-faq .faq-step:first-child {
    padding-left: 0;
  }
  .page-faq .faq-step:last-child {
    padding-right: 0;
  }
}

/* --- 问答分组 --- */
.page-faq .faq-group {
  margin-top: 60px;
}
.page-faq .faq-group__head {
  position: relative;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--edge);
}
.page-faq .faq-group__head::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 76px;
  height: 2px;
  background: var(--c-orange);
}
.page-faq .faq-group__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 3.4vw, 29px);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--c-warm);
}
.page-faq .faq-group__idx {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-line);
}

/* --- 折叠问答 --- */
.page-faq .faq-list {
  display: grid;
  gap: 10px;
  margin-top: 20px;
}
.page-faq .faq-list .bk-fold {
  border: 1px solid var(--edge-soft);
  border-left: 3px solid var(--c-line);
  background: var(--c-stand);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.page-faq .faq-list .bk-fold[data-open="true"] {
  border-left-color: var(--c-orange);
  background: var(--c-panel);
}
.page-faq .faq-list .bk-fold__head {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  text-align: left;
}
.page-faq .faq-list .bk-fold__body {
  padding: 0 18px 18px 18px;
}
.page-faq .faq-list .bk-fold:not([data-open="true"]) .bk-fold__body {
  display: none;
}
.page-faq .faq-list .bk-fold__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--c-muted);
}
.page-faq .faq-tag {
  flex: 0 0 auto;
  font-size: 11px;
  letter-spacing: 0.12em;
  padding: 3px 8px;
}
.page-faq .faq-fold__q {
  flex: 1 1 auto;
  min-width: 0;
  line-height: 1.6;
}

/* --- 对照示意图 --- */
.page-faq .faq-figure {
  margin: 26px 0 0;
}
.page-faq .faq-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  border-left: 2px solid var(--c-cyan);
  background: var(--c-panel);
}
.page-faq .faq-figure__cap {
  margin: 12px 0 0;
  padding-left: 12px;
  border-left: 2px solid var(--edge);
  font-size: 12.5px;
  line-height: 1.7;
  letter-spacing: 0.03em;
  color: var(--c-line);
}

/* --- 联系通道带 --- */
.page-faq .faq-channel {
  display: grid;
  gap: 18px;
  align-items: center;
  margin-top: 44px;
  padding: 24px 22px;
  border: 1px solid var(--c-orange);
  background:
    linear-gradient(100deg, rgba(255, 106, 26, 0.16), rgba(35, 224, 200, 0.06) 72%),
    var(--c-stand);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}
.page-faq .faq-channel__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--c-warm);
}
.page-faq .faq-channel__text {
  margin: 10px 0 0;
  max-width: 56ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--c-muted);
}
.page-faq .faq-channel .bk-btn {
  justify-self: start;
}

@media (min-width: 760px) {
  .page-faq .faq-channel {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 32px;
    padding: 28px 32px;
  }
  .page-faq .faq-channel .bk-btn {
    justify-self: end;
  }
}

/* --- 尾部联系面板 --- */
.page-faq .faq-contact {
  margin-top: 62px;
}
.page-faq .faq-contact__grid {
  display: grid;
  gap: 22px;
  align-items: center;
  margin-top: 18px;
}
.page-faq .faq-contact__text {
  margin: 12px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--c-muted);
}
.page-faq .faq-contact__grid .bk-btn {
  justify-self: start;
}

@media (min-width: 760px) {
  .page-faq .faq-contact__grid {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 36px;
  }
  .page-faq .faq-contact__grid .bk-btn {
    justify-self: end;
  }
}

/* --- 返回顶部 --- */
.page-faq .bk-to-top {
  margin-top: 48px;
}

/* --- 动效收敛 --- */
@media (prefers-reduced-motion: reduce) {
  .page-faq *,
  .page-faq *::before,
  .page-faq *::after {
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
  }
}